Loans Summary of Activity in Allowance for Acquired Loan and Lease Losses (Details) - Receivables Acquired with Deteriorated Credit Quality [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 108	$ 90	$ 108	$ 233
Recovery of loan losses	0	0	0	(143)
Ending balance	$ 108	$ 90	$ 108	$ 90